Research on the kinetics of and synthesis of dibutyl phthalate

Dibutyl Phthalate was synthetized from phthalic anhydride and butyl alcohol under the catalysis of JY-0719.The effects of main factors including the mol ratio of phthalic anhydrideto butyl alcohol,dosage of catalysts and reaction time on the esterification reaction were mainly investigated,and the kinetics of the esterification reaction was investigated.The experimental results show that when the mol ratio of butyl alcoholto phthalic anhydride was 3,the dosage of catalysts was 0.8% and the reaction time was 270 min,a maximum yield of 94% is obtained.The kinetic process of esterification reaction was one kind of consecutive reaction.The first step,the formation of monoisooctyl terephthalate acid from phthalic anhydride and butyl alcohol was a faster step,and the second step,formation of DBP from monoisooctyl terephthalate acid and butyl alcohol was a low step,and the frequency factor was k2=0.0009 L·mol-1·min-1.